Located in Grafton County in New Hampshire's Lakes Region, Holderness recorded an average radon level of 8.0 pCi/L from available testing, which exceeds the EPA action level of 4.0 pCi/L. The community's homes, many featuring full basements, sit on New England's characteristic glacial till over granitic bedrock, geological conditions that readily produce and concentrate radon gas.
8.00
pCi/L average
Above EPA Action Level
Based on 1 user-submitted radon test for homes in Holderness, NH. The EPA recommends taking action at or above 4.0 pCi/L.
0
4.0 EPA
10+
Holderness, NH Radon Mitigation
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User-submitted radon test readings from homes in the Holderness area.
Radon Level
City
Home Age
Foundation
8 pCi/L
Holderness, NH
0-20 Years
No Basement/All Crawl Space
Have a radon test result for Holderness? Submit your reading to help other homeowners.
Radon FAQ for Holderness, NH
What is the average radon level in Holderness, NH?
Based on 1 user-submitted test, the average radon level in Holderness is 8.00 pCi/L. This exceeds the EPA's recommended action level of 4.0 pCi/L, and radon testing is recommended for all homes in the area.
What EPA Radon Zone is Holderness in?
Holderness and the 03245 zip code are in Grafton County, which has an EPA assigned Radon Zone of 2. A zone of 2 predicts an average indoor radon screening level between 2 and 4 pCi/L.
How much does radon mitigation cost in Holderness?
Radon mitigation in Holderness typically costs between $800 and $2,000. Most homes with standard basements can be mitigated with a sub-slab depressurization system in the $1,000–$1,500 range. Factors that can increase cost include complex foundations, crawl spaces, or very high radon levels.
Should I test for radon if I'm buying a home in Holderness?
Yes. Radon testing should be part of every home purchase. A short-term radon test is typically included as part of the home inspection process and costs $150–$250. If elevated levels are found, you can negotiate mitigation as part of the sale.
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